| abstract |
A liquid crystal compound having a high voltage holding ratio, a low limit voltage, a very low temperature dependency, a large Δn value and excellent miscibility with other liquid crystal materials at low temperatures, a liquid crystal composition including the same, and a liquid crystal display device using the same are described. The liquid crystal compound is a substituted benzene derivative of formula (1).n n n Formula 1n n n n n n n n In Formula 1 above,n n n R is a linear or branched alkyl group having 1 to 20 carbon atoms, and methylene groups (-CH 2- ) which are not adjacent to each other in the alkyl group may be substituted by an oxygen atom,n n n X is a halogen atom, -CF 3 , -CF 2 H, -CFH 2 , -OCF 3 or -OCF 2 H,n n n Z 1 and Z 2 are each independently — (CH 2 ) 2 —, — (CH 2 ) 4 —, —CH 2 O—, —OCH 2 — or a covalent bond, provided that Z 1 and Z 2 are covalently bonded at the same time Notn n n Y 1 , Y 2 , Y 3 , Y 4 , Y 5 and Y 6 are each independently H or F, provided that at least one of Y 1 , Y 2 , Y 3 and Y 4 is F,n n n Any atom constituting the compound may be substituted by its isomers. |